| ( | 42 25 | + | x | ) | ÷ | ( | 51 50 | + | x | ) | = | 1 | ÷ | 309 500 |
| 方程两边同时乘以: | ( | 51 50 | + | x | ) |
| ( | 42 25 | + | x | ) | = | 1 | ÷ | 309 500 | × | ( | 51 50 | + | x | ) |
42 25 | + | x | = | 1 | ÷ | 309 500 | × | ( | 51 50 | + | x | ) |
42 25 | + | x | = | 1 | ÷ | 309 500 | × | 51 50 | + | 1 | ÷ | 309 500 | × | x |
42 25 | + | x | = | 170 103 | + | 500 309 | x |
| x | − | 500 309 | x | = | 170 103 | − | 42 25 |
| - | 191 309 | x | = | 170 103 | − | 42 25 |
| - | 191 309 | x | = | - | 76 2575 |
76 2575 | = | 191 309 | x |
191 309 | x | = | 76 2575 |
| x | = | 76 2575 | ÷ | 191 309 |
| = | 76 2575 | × | 309 191 |
| x | = | 23484 491825 |
| x | = | 228 4775 |
| x | = | 0.047749 |